Patent EP-1136413-A1 (EP)
Inventor: BORGER ERHARD
IPC: B65H65/00
Filed: 2000-03-22
Abstract: At a bobbin winder, the wound bobbin (10) is moved out of the winding position by a swing arm (20) before the end of the yarn is secured. It is shifted into a position (21) offset from the winding setting, for the end yarn to be tucked into the wound yarn layer. The yarn tucking unit (16) lies behind and over the wound bobbin (10), in the yarn tucking position (21). It has a needle arm (22) which extends into the working zone (18) of the yarn tucking needle at the wound bobbin (10), in the tucking position (21) or away from the winding position. The needle arm (22) is a twin-arm lever, where the tucking needle is carried at the end of one arm and the drive acts on the other arm end for the working zone (18) with at least one servo motor (23) as the drive. The servo motor (23) acts on a rotating disk (24), linked to the needle arm (22) by a carrier pin (25). A rotating/sliding guide is between the carrier pin (25) and a link pin at the tucking unit (16). The needle arm (22) is weighted at the side towards the bobbin, for the weight to give a parallel lie for the tucking needle at the bobbin (10). The drive side of the needle arm (22) grips into a slide slit (29), with an increase in the slit width to give the parallel lie of the tucking needle at the bobbin (10). The needle arm (22) has an increased width at the slit expansion, at one end, to prevent a parallel lie in one of the directions of the reciprocating movement of the needle arm (22). The needle arm (22) drive can be with two servo motors. The first motor moves the needle arm (22) across the bobbin (10). The second motor drives a crankshaft to give the needle arm (22) rotation at the working zone (18) of the tucking needle. A tine (17) holds the end yarn over the bobbin (10) for tucking, and can clamp the yarn as required. The swing arm (20) carries the bobbin (10) from the winding position into the yarn tucking position (21), and then moves into the location to pick up a fresh bobbin sleeve. When the cut yarn has been tucked into the wound bobbin (10), the clamping tine (17) carries the starting end of the yarn, for the new bobbin sleeve, with the movements of the swing arm (20). The yarn holding tine can be a twin-arm lever. One arm carries a V-shaped yarn catch, and the other arm has an operating end within the swing range of the swing arm (20), for a swing movement to hold the yarn end over the bobbin (10). The yarn catch can swing on an axis, parallel to the swing arm axis, against a return force. A yarn clamp can be set by a motor as required, together with the yarn cutter, to clamp the end yarn, and to carry the start end of the cut yarn into the working zone of the yarn clamp at the swing arm. An Independent claim is included for a bobbin winding operation, where the bobbin (10) is moved out of the winding position by a swing arm (20) into a position (21) where the end of the yarn is tucked into the wound yarn layer on the bobbin (10). Preferred Features: The yarn tucking, by the tucking needle, is at the highest point of the bobbin (10) or in front of the bobbin from the winding point. The needle arm (22) is operated by at least one servo motor (23), and the tucking needle moves on a path to grasp the yarn (11) and bring it to the laying point on the bobbin (10) where it is brought into the laying point by the weight of the needle arm (22). The tucked end yarn is clamped by the tine (17), and the yarn is cut between it and the bobbin (10). When the yarn has been cut, the tine (17) carries the start end for the new winding to the yarn clamp at the swing arm (20). After delivery of the bobbin (10) into the yarn end tucking position (21), the swing arm (20) moves into the position to collect a fresh bobbin sleeve. The rotary angle setting of the bobbin (10) is corrected as required, between the winding and tucking (21) stations. The wound bobbin (10), with a tucked end yarn, is removed from the tucking position and transferred to a container.